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Difference between gnome-screensaver-command -a and gnome-screensaver-command -l

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linux-howto

http://askubuntu.com – I was trying to figure out difference between gnome-screensaver-command -a and gnome-screensaver-command -l According to the gnome-screensaver-command man page... -l, --lock Tells the running screensaver process to lock the screen immediately -a, --activate Turn the screensaver on (blank the screen) For me in both the cases it generated the login screen.Can some one outline the difference in the two things?? (HowTos)